Question

Se dau mulțimile A={1,2,3};B={a²|a€A}. Determinați a reunit cu b​

Answer 1

A={1,2,3} si B={1,4,9} (le punem la puterea a doua)
A reunit cu B={1,2,3,4,9}
Sper ca e corect. Succes

Answer 2

$\it 1^2=1;\ \ 2^2=4;\ \ 3^2=9\ \ \Rightarrow B=\{1,\ \ 4,\ \ 9\}\\ \\ \\ A\cup B=\{1,\ \ 2,\ \ 3\}\cup \{1,\ \ 4,\ \ 9\}=\{1,\ \ 2,\ \ 3,\ \ 4,\ \ 9\}$